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Technology (Greek technologia (τεχνολογία) < techne (τέχνη) "craft" + logia (λόγος); "saying") is the application of developments in science and engineering to benefit humanity. It may be defined as: "Solutions for real human problems by the development and application of tools, machines, materials, goods, or information in the form of skills, knowledge, processes, blueprints, plans, diagrams, models, formulae, tables, engineering designs, specifications, manuals, or instructions."

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A solar cell or photovoltaic cell is a device that converts solar energy into electricity by the photovoltaic effect. Photovoltaics is the field of technology and research related to the application of solar cells as solar energy.

Sometimes the term devices intended specifically to capture energy from sunlight, while the term photovoltaic cell is used when the source is unspecified.

Assemblies of cells are used to make solar modules, which may in turn be linked in photovoltaic arrays.

Solar applications. Individual small devices as electronic calculators. Photovoltaic arrays generate a form of renewable electricity, particularly useful in situations where from the grid as in remote area power systems, Earth-orbiting satellites and space probes, remote radiotelephones and water pumping applications. Photovoltaic electricity is also increasingly deployed in grid-tied electrical systems.

Similar devices intended to capture from other sources include thermophotovoltaic cells, betavoltaics cells, and optoelectric nuclear battery.

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Most authorities regard the wheel as one of the oldest and most important inventions, which originated in ancient Mesopotamia in the 5th millennium BC (Ubaid period), originally in the function of potter's wheels. Near the northern side of the Caucasus several graves were found, in which since 3700 BC people had been buried on wagons or carts (both types). The earliest depiction of what may be a wheeled vehicle (here a wagon—four wheels, two axles), is on the Bronocice pot, a ca. 3500 BC clay pot excavated in southern Poland.

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Did you know...

... that both the Mozilla Firefox and Microsoft Internet Explorer web browsers descended from Netscape Navigator?

... that a coherer, hot wire barretter, electrolytic detector, cat's whisker and vacuum tube were all types of radio detectors?

... that in 2008 Hewlett-Packard created a prototype of the theoretical fourth and last passive circuit element, the memristor, that may one day revolutionize electronics, although the theory was devised in 1971?

... that a mercury arc rectifier converts alternating current to direct current by means of an electric arc through mercury vapor?

... that only one of the 266 1076 Class steam locomotives built for the Great Western Railway was named, and the rest had only numbers?

... that the six Charles Tayleur locomotives ordered by Isambard Kingdom Brunel for the Great Western Railway were unsuccessful?

Tropical Storm Wilma regional imagery, 2005

... that the intensity of a tropical cyclone (pictured) is usually determined by the Dvorak technique using only visible and infrared satellite images?